Everything is brand new, still overheating.

[Jim S]

I pulled the trigger and bought a 350 long block freshly professionally rebuilt.  I have a brand new aluminum Avanti radiator. I have a heavy duty racing water pump and electric fan.  The new engine needs to be run a 2,000 rpm for 30 mins to break in.  I can't run it for 15 mins without the temp guage pegging to 240 and it overheating. I've purged the air out as well.  I am lost why this thing won't run cooler.  If I can't fix it soon, it will have to be sold at a huge loss.  A friend told me that Avantis have an inherant air flow problem through the radiator.  He said some people got more flow installing an air dam.  Has anyone tried this? Or does anyone make an aftermarket add on?

 

Edited 16 hours ago by Jim S

[Gunslinger]

Yes…an air deflector directs more air to the radiator that would otherwise create turbulent airflow under the car.  It serves no purpose idling but really helps at speed.

[wildfelr]

RQB3263/81/305 .... THERE ARE STILL SEVERAL THINGS YOU CAN DO ... ALL TOGETHER  MAY HELP  .... INDIVIDUALLY NOT SO MUCH ...AIR DAM WILL HELP DOWN THE ROAD ... I GOT MINE FROM  MICHEAL PHILLIPS IN PA....I BELIEVE HE IS THE ONLY MFG./SUPPLIER.....PICK A TARGET TEMP I SUGGEST 200 DEGREES RUN IT TO THAT POINT AND SHUT IT OFF AND COOL DOWN... TIME  IT  AND DO IT AGAIN ...EACH TIME IT SHOULD TAKE LONGER UNTILL IT WILL RUN AT 200 CONTINUOUSLY ... THIS WILL INDICATE YOUR ENGINE BREAK-IN IS COMPLETE ... CHANGE THE OIL AND FILTER .... ALSO INSTALL A TRANS COOLER AND GET THAT HEAT OUT OF THE RADIATOR ... I NEVER COULD UNDERSTAND THAT ... REMOVE THE HEAR RISER VALVE FROM THE EXHAUST MANIFOLD ... IS YOUR ELECTRIC FAN BLOWING THE RIGHT DIRECTION ??   BE SURE THE THERMOSTAT IS 180 WITH 4 OR 5  .. 3/16 HOLES DRILLED  .... HOW ABOUT  THE WATER PUMP IMPELLER  NOT IMPOSSIBLE IT HAS THE WRONG IMPELLER... IVE SEEN IT BEFOR ...ALSO IN THE SUMMER TIME I SPACE THE HOOD LATCHES UP  3/4 INCH REQ LONGER BOLTS... 5 MINUTE JOB ...AND SWITCH BACK AT THANKSGIVING .... 

[wildfelr]

RQB3263..... MICHEAL PHILLIPS  215-260-8377  AIR DAM SUPPLIER MANUFACTURER 

[wildfelr]

RQB3263...... BRAND NEW DOESN'T GUARANTEE CORRECT OR QUALITY .... WELL THATS ANOTHER STORY.....CHECK WATER PUMP BELT TENSION ...  AND IGNITION TIMING....IN COMBINATION BUT MORE THAN LIKELY ONE THING RESTRICTING AIR OR WATER FLOW AND NOT A MAJOR PROBLEM WITH YOUR NEW ENGINE..... INTERESTING KEEP IN TOUCH HERE... BILL IN FLORIDA

[Jim S]

Thank-you everyone.  I guess I have my work cut out for me!

[wildfelr]

RQB3263..... EXHAUST/TAIL PIPE/MUFFLER BLOCKAGE ...COLLAPSED MUFFLER.....ANOTHER POSSIBILITY